diff --git a/includes/utilities.php b/includes/utilities.php
index 69f0591..4eac814 100644
--- a/includes/utilities.php
+++ b/includes/utilities.php
@@ -128,12 +128,11 @@ function compareThematiquePriority($postA, $postB)
 	$priorityA = $postA->thematique_priority ?? 0;
 	$priorityB = $postB->thematique_priority ?? 0;
 
+	$thematiqueA = getPostMainThematique($postA);
+	$thematiqueB = getPostMainThematique($postB);
+
 	if ($priorityA == $priorityB) {
-		if ($postA->post_date > $postB->post_date) {
-			return -1;
-		} else {
-			return 1;
-		}
+		return strcmp($thematiqueA->name, $thematiqueB->name);
 	}
 	if ($priorityA < $priorityB) {
 		return 1;